1. 802.11ad New Technique Proposal
March 2010
doc.: IEEE /0xxxr0
March 2010
802.11ad New Technique Proposal
Date:
Authors:
Yuichi Morioka, Sony Corporation
Yuichi Morioka, Sony Corporation

2. March 2010
doc.: IEEE /0xxxr0
March 2010
Abstract
In order to differentiate from other 60GHz standards, ad should support Wireless LAN range
802.11ad should effectively migrate over past standards, to add support for this range
Schemes that use 2.4/5GHz frames to assist 60GHz operation are proposed in this document
Yuichi Morioka, Sony Corporation
Yuichi Morioka, Sony Corporation

3. March 2010
doc.: IEEE /0xxxr0
March 2010
60GHz for Family
60GHz is a promising technology that will provide throughputs over 1Gbps
60GHz can provide solutions for various applications from local file transfer to HD Video transfer
Due to its benefits, there are competing standards that also use 60GHz
802.11ad needs clear and simple messaging to differentiate from “non-WLAN” technology
Yuichi Morioka, Sony Corporation
Yuichi Morioka, Sony Corporation

4. User Expectations for 802.11ad
March 2010
doc.: IEEE /0xxxr0
March 2010
User Expectations for ad
User will expect of ad…
the same experience as past plus faster data rate
the same ranges as past
should provide consistant Wireless LAN ranges
The “because it is 60GHz” excuse will not be understood by the user
Users will not tolerate implementer centric excuses
Have caused many standards to die
May turn users away from ad
802.11ad must support a mode of operation that provides equivalent range as with past , to meet user expectation and to succeed in the market
Yuichi Morioka, Sony Corporation
Yuichi Morioka, Sony Corporation

5. March 2010
doc.: IEEE /0xxxr0
March 2010
Migration with past
Merit of ad is that it can build upon past successful standards
Natural evolutionary path is to have a/b/g/n capability coinciding with ad
E.g a/n/ad system
We rarely see n stand alone chips
802.11ad should fully utilize its past assets, to better provide the expected user experience
Yuichi Morioka, Sony Corporation
Yuichi Morioka, Sony Corporation

6. March 2010
doc.: IEEE /0xxxr0
March 2010
2.4/5GHz Assisted 60GHz
Beamforming would be the key technology to enhance 60GHz range
However, beamforming could only be functional after discovery and training of the target device
If a/b/g/n can coincide with ad, they can be used to better facilitate 60GHz beamforming
Yuichi Morioka, Sony Corporation
Yuichi Morioka, Sony Corporation

7. 2.4/5GHz Beaconing for 60GHz Service Discovery
March 2010
doc.: IEEE /0xxxr0
March 2010
2.4/5GHz Beaconing for 60GHz Service Discovery
Example 2.4/5GHz Beacon Structure
One simple solution is to utilize 2.4/5GHz Beacons to provide service discovery for 60GHz
This will allow ad STAs to discover the presence of ad AP even when they are out of 60GHz omni range
Definition of 60GHz Capability IE may be adequate
Yuichi Morioka, Sony Corporation
Yuichi Morioka, Sony Corporation

8. 2.4/5GHz Beaconing for 60GHz Beacon Offset (1/2)
March 2010
doc.: IEEE /0xxxr0
March 2010
2.4/5GHz Beaconing for 60GHz Beacon Offset (1/2)
Example 2.4/5GHz Beacon Structure
Along with 2.4/5GHz Beacon, 60GHz Beacon may be sent to maintain interoperability with other 60GHz systems
If the transmission timing of the 60GHz Beacon is notified using the 2.4/5GHz Beacon, it will be easier for the 11ad STAs to discover the necessity of updating its beamform information
Yuichi Morioka, Sony Corporation
Yuichi Morioka, Sony Corporation

9. 2.4/5GHz Beaconing for 60GHz Beacon Offset (2/2)
March 2010
doc.: IEEE /0xxxr0
March 2010
2.4/5GHz Beaconing for 60GHz Beacon Offset (2/2)
60GHz Beacon Reception Sequence
60GHz Beacon Reception Sequence
By notifying the tx timing of the 60GHz Beacon through 2.4/5GHz Beacon, 11ad STAs could adjust the rx beam-pattern to the AP at the defined timing
Provided that prior training sequence has occurred
If the 60GHz Beacon is not received at the expected time (as in STA3 above), the STA immediately knows that re-training is necessary
Yuichi Morioka, Sony Corporation
Yuichi Morioka, Sony Corporation

10. 2.4/5GHz Beaconing for 60GHz Scheduling (1/2)
March 2010
doc.: IEEE /0xxxr0
March 2010
2.4/5GHz Beaconing for 60GHz Scheduling (1/2)
Example 2.4/5GHz Beacon Structure
Furthermore, 2.4/5GHz Beacons could provide Scheduling Information for 60GHz
This information could be used to adjust the rx/tx beam-pattern to the intended receiver/transmitter to maximize the range
Yuichi Morioka, Sony Corporation
Yuichi Morioka, Sony Corporation

11. 2.4/5GHz Beaconing for 60GHz Scheduling (2/2)
March 2010
doc.: IEEE /0xxxr0
March 2010
2.4/5GHz Beaconing for 60GHz Scheduling (2/2)
The receiver (in the above case the AP) could adjust the rx beam-pattern to the scheduled transmitter
The transmitter (STA) could also beamform the RTS frame to the AP
Yuichi Morioka, Sony Corporation
Yuichi Morioka, Sony Corporation

12. 2.4/5GHz management frames for 60GHz - Broadcast
March 2010
doc.: IEEE /0xxxr0
March 2010
2.4/5GHz management frames for 60GHz - Broadcast
Management frames such as 2.4/5GHz Re-Scheduling Frame can be defined to better facilitate 60GHz
2.4/5GHz frames can be used to communicate with all members of the BSS while 60GHz frames are used to communicate to one member
Yuichi Morioka, Sony Corporation
Yuichi Morioka, Sony Corporation

13. 2.4/5GHz management frames for 60GHz - Training
March 2010
doc.: IEEE /0xxxr0
March 2010
2.4/5GHz management frames for 60GHz - Training
2.4/5GHz management frames could also be beneficial to aid between STAs whose 60GHz training information is not available or too aged
2.4/5GHz Training Request/Confirm management frames can be used to initiate 60GHz training procedure
Yuichi Morioka, Sony Corporation
Yuichi Morioka, Sony Corporation

14. 2.4/5GHz Control Frames to assist 60GHz BF
March 2010
doc.: IEEE /0xxxr0
March 2010
2.4/5GHz Control Frames to assist 60GHz BF
2.4/5GHz Control Frames can provide fully integrated system between 60GHz and 2.4/5GHz
2.4/5GHz Control Frames can assist 60GHz training
Signal the start of 60GHz Training Frame (e-RTS)
Provide feedback information and Acknowledgement information (e-CTS)
Yuichi Morioka, Sony Corporation
Yuichi Morioka, Sony Corporation

15. 2.4GHz Assisted 60GHz Training
March 2010
doc.: IEEE /0xxxr0
March 2010
2.4GHz Assisted 60GHz Training
60GHz Training Frame Structure
In order to maximize range, the 60GHz Training Frame could be configured in a way that it contains multiple beam patterns
The start of the 60GHz Training Frame could be signalled with 2.4/5GHz frame
The beamformee could report back the strongest beam pattern it receives
Feedback can be sent using 2.4/5GHz training frames
Yuichi Morioka, Sony Corporation
Yuichi Morioka, Sony Corporation

16. March 2010
doc.: IEEE /0xxxr0
March 2010
Conclusions
Several ways to effectively use 2.4/5GHz frames to assist 60GHz operation has been proposed
2.4/5GHz Beaconing
2.4/5GHz Management Frames assisted 60GHz scheduling
2.4/5GHz Management Frames assisted 60GHz training
2.4/5GHz Control Frames assisted 60GHz training
The proposed methods will provide the necessary range to satisfy end user
These key features will make ad an unique and successful 60GHz standard
Yuichi Morioka, Sony Corporation
Yuichi Morioka, Sony Corporation

17. March 2010
doc.: IEEE /0xxxr0
March 2010
Strawpoll
Do you feel an optional feature that uses 2.4/5GHz frames to assist 60GHz operation is worth further exploration within ad?
Yes No
Don’t know/Don’t care
Yuichi Morioka, Sony Corporation
Yuichi Morioka, Sony Corporation

18. Reference March 2010 March 2010 doc.: IEEE 802.11-10/0xxxr0
Yuichi Morioka, Sony Corporation
Yuichi Morioka, Sony Corporation